Delphinus capensis [Long-beaked Common Dolphin]
× Delphinus delphis [Short-beaked Common Dolphin] ENHR. Jefferson and Van Waerebeek (2002) found clinal variation between these types in the Indian Ocean, which indicates gene flow between the them.
× Lagenorhynchus obscurus [Dusky Dolphin] NHR(Peru). Dolphins of these two types frequently associate in large groups of up to a thousand animals, of which duskies generally make up less than ten percent of the individuals present. Reyes 1996.
× Tursiops truncatus (♂) [Common Bottle-nosed Dolphin] CHR. HPF(♀♀). CON: Indian, Pacific, and Atlantic oceans. Four different bottlenose females bore hybrids to a Tursiops truncatus male at SeaWorld in southern California. A male and a female hybrid have both lived ten years. The female backcrossed to T. truncatus. First crosses are intermediate in color, striping pattern, and body proportions. However, the backcross calf was similar in size and overall appearance to Tursiops truncatus. Tooth count is a good indicator of hybridity: F1 hybrids and a neonate backcross have more teeth than T. truncatus (76-104) and fewer than D. capensis (189-227). Zornetzer and Duffield 2003.

Pseudorca crassidens[False Killer Whale]
× Tursiops truncatus (♂) [Common Bottle-nosed Dolphin] CHR(Japan and at Sea Life Park, Hawaii). NHR?? CON: Indian, Pacific, and Atlantic oceans. HPF(♀♀). Wolphins, as the hybrids are known, are intermediate in size (~3m long, ~270kg), color and shape. They have 66 teeth (a bottlenose has 88, a false killer whale, 44). A female wholphin produced two calves in backcrosses to T. truncatus (which look much like bottlenoses). At 6 months one was already the size of a year-old bottlenose. Herds of false killer whales and bottlenose dolphins associate in the wild and there are anecdotal reports of natural hybrids. False killer whales are about five times as large bottle-nosed dolphins. A female hybrid born in May 1985 at Sea World in Hawaii was still alive in 1998. This hybrid reaches a weight of about 800 lbs and a length of 12 feet. Bottle-nosed dolphins and false killer whales differ markedly in gestation period (12 months and 15.5 months, respectively). Breese 1992; Duffield 1999; International Zoo Yearbook 1990 (p. 453); Nishiwaki and Tobayama 1982, 1984; Odell and McClune 1999 (p. 230†, 235); Ryan 1985; Sylvestre and Tasaka 1985. Internet Citations: HOTS†.

Sousa chinensis [Indo-Pacific Humpbacked Dolphin]
× Tursiops truncatus (♂) [Common Bottle-nosed Dolphin] NHR(e coast of Africa). CON: Indian and southwestern Pacific oceans. Copulation was observed between Tursiops males and Sousa females off the coast of Zanzibar (Stensland et al. 1998), and Karczmarski et al. (1997) observed and photographically documented an S. chinensisfemale accompanied by a Tursiops-like calf in Algoa Bay on the Eastern Cape coast of South Africa. The pair was in a group of dolphins that otherwise only contained humpbacks.

Stenella attenuata[Pantropical Spotted Dolphin]
× Stenella longirostris (♀) [Spinner Dolphin] NHR(Fernando de Noronha Archipelago, tropical West Atlantic). A repeatedly sighted hybrid, living in a large group of spinner dolphins, had a S. longirostris mother. Silva et al. 2005.
× Tursiops truncatus (♂) [Common Bottle-nosed Dolphin] ENHI? Perrin et. al. report that Stenella frontalis (Atlantic Spotted Dolphin)is morphologically intermediate with respect to many characters, for example, weight, osteological measures, skull characters, details of skin coloration etc., and that it is markedly variable. Moreover, LeDuc et al. found that cytochrome B sequences of T. truncatus and T. aduncus were more similar to those of S. frontalis than to those of S. attenuata, with which S. frontalis is often lumped. Such findings suggest S. frontalis as a PHP of this cross (although there are no explicit reports that such is the case). T. aduncus is often lumped under T.truncatus (as in Perrin et al.), but is also treated separately (as in LeDuc et. al.). LeDuc et al. 1999; Perrin et. al. 1987.

Stenella coeruleoalba [Striped Dolphin]
× Stenella longirostris (♂) [Spinner Dolphin] ENHR. Molecular genetic tests indicate that the Clymene Dolphin (Stenella clymene) first arose from this cross. Its mitochondrial DNA is similar to that of striped dolphins, which shows that the maternal parent in the original cross was S. coeruleoalba. However, nuclear similarity to spinner dolphins is consistent with the idea that the initial hybrids backcrossed with Stenella longirostris to produce S. clymene. According to a New York Times interview with Dr. Ann J. Amaral, leader of the study that first reported this cross, "There is still a little 'backcrossing' going on between species, where occasionally a spinner dolphin might breed with a clymene dolphin... The three species also live harmoniously in the Atlantic Ocean, even cooperating at times." See also: Stenella clymene × Stenella longirostris. Amaral et al. 2014.

Tursiops aduncus [Indo-Pacific Bottle-nosed Dolphin]
× Tursiops truncatus [Common Bottle-nosed Dolphin] CANHR. CON: Atlantic, Indian, and Pacific oceans. Kemper says a specimen collected off the southern coast of Australia was a suspected hybrid on the basis of its mtDNA haplotype and that other individuals in her study were morphologically intermediate. Aduncus is an inshore form, truncatus, a larger, offshore form. The two are often lumped under T. truncatus. Wang et al. argue that reproductive isolation between these dolphins must be nearly complete, but mention a likely natural hybrid (p. 154). However, they are so similar that hybrids, both captive and natural, may be underreported (see Introduction, p. 00). International Zoo Yearbook 1988 (p. 465); Kemper 2004 (pp. 30, 42-43); Sylvestre and Tasaka 1985; Wang et al. 2000.